Study On Subgrade Treatment Technology Of Saline Soil In Hexi Region Of Gansu Province

Gansu hexi area saline soil is a very special soil containing more salt and a kind of itself of the nature along with the change of temperature, water, particularly sensitive to the environment. Because of these unique nature, many engineering constructions in saline soil region of hexi in Gansu province will produce diseases in many different forms, such as salt expansion, dissolve trap, pumping, salinization and other diseases. So, in order to better control and improve the soil salinization, solve the problem of engineering construction in the construction of highway engineering of saline soil subgrade treatment should be strengthened countermeasure research, if not taking measures, it will have a great influence on the normal use of roadbed. Therefore,we should take the treatment methods and technology research of saline soil subgrade in hexi corridor of gansu province.In this paper, cement, lime is used to reinforce the hexi saline soil and comprehensive consideration of solidified saline soil water, salt and temperature, the influence of the experimental study on saline soil. The article uses the compaction test, CBR and unconfined full water compressive strength and water stability, freeze-thaw cycle, temperature shrinkage test of reinforcement in hexi saline soil physical properties, the road performance and handling technology, etc are analyzed. Finally, combining with the above all kinds of test gives the number of freeze-thaw stability, resistance to stability coefficient to evaluate reinforcement hexi antifreeze performance of saline soil, water stability coefficient is put forward as water stability evaluation index, etc.According to the above content and composite pavement test need to satisfy the basic technical indexes and economic factors, such as: using 4% cement + 6% to reinforce the hexi saline soil, lime mixture as subgrade filling can achieve good performance.In addition, according to hexi generated by saline soil of highway subgrade failure modes were analyzed and inorganic binder to reinforce the study of the mechanism of saline soil in hexi area, summarizes the treatment of saline soil reinforcement method, provides reference for future construction.